Method DrawRectangle

Source/Engine/Render2D/Render2D.cpp:1461–1624

}

void Render2D::DrawRectangle(const Rectangle& rect, const Color& color1, const Color& color2, const Color& color3, const Color& color4, float thickness)
{
    RENDER2D_CHECK_RENDERING_STATE;

    const auto& mask = ClipLayersStack.Peek().Mask;
    float thick = thickness;
    thickness *= (TransformCached.M11 + TransformCached.M22 + TransformCached.M33) * 0.3333333f;

    // When lines thickness is very large, don't use corner caps and place line ends to not overlap
    if (thickness > 4.0f)
    {
        thick *= Math::Lerp(0.6f, 1.0f, Math::Saturate(thick - 4.0f)); // Smooth transition between soft LineAA and harsh FillRect
        Float2 totalMin = rect.GetUpperLeft() - Float2(thick * 0.5f);
        Float2 totalMax = rect.GetBottomRight() + Float2(thick * 0.5f);
        Float2 size = totalMax - totalMin;
        Render2DDrawCall& drawCall = DrawCalls.AddOne();
        drawCall.Type = NeedAlphaWithTint(color1, color2, color3, color4) ? DrawCallType::FillRect : DrawCallType::FillRectNoAlpha;
        drawCall.StartIB = IBIndex;
        drawCall.CountIB = 6 * 4;
        // TODO: interpolate colors from corners to extended rectangle edges properly
        WriteRect(Rectangle(totalMin.X, totalMin.Y, size.X, thick), color1, color2, color2, color1);
        WriteRect(Rectangle(totalMin.X, totalMin.Y + rect.Size.Y, size.X, thick), color4, color3, color3, color4);
        WriteRect(Rectangle(totalMin.X, totalMin.Y + thick, thick, rect.Size.Y - thick), color1, color1, color4, color4);
        WriteRect(Rectangle(totalMax.X - thick, totalMin.Y + thick, thick, rect.Size.Y - thick), color2, color2, color3, color3);
        return;
    }

    Float2 points[5];
    ApplyTransform(rect.GetUpperLeft(), points[0]);
    ApplyTransform(rect.GetUpperRight(), points[1]);
    ApplyTransform(rect.GetBottomRight(), points[2]);
    ApplyTransform(rect.GetBottomLeft(), points[3]);
    points[4] = points[0];

    Color colors[5];
    colors[0] = color1;
    colors[1] = color2;
    colors[2] = color3;
    colors[3] = color4;
    colors[4] = colors[0];

    Render2DVertex v[4];
    uint32 indices[6];
    Float2 p1t, p2t;
    Color c1t, c2t;

    p1t = points[0];
    c1t = colors[0];

#if RENDER2D_USE_LINE_AA
    Render2DDrawCall& drawCall = DrawCalls.AddOne();
    drawCall.Type = DrawCallType::LineAA;
    drawCall.StartIB = IBIndex;
    drawCall.CountIB = 4 * (6 + 3);

    // This must be the same as in HLSL code
    const float filterScale = 1.0f;
    const float thicknessHalf = (2.82842712f + thickness) * 0.5f + filterScale;